There were some real surprises to me as far as larger countries that did NOT make this list.
The Brazilian northeast is semi-arid but not desert. Here is Wikipedia's definition of such climate: "A semi-arid climate or steppe climate is the climate of a region that receives precipitation below potential evapotranspiration, but not as low as a desert climate." (https://en.wikipedia.org/wiki/Semi-arid_climate)
Everything I saw was flat and grassy.